README.md in octopress-3.0.9 vs README.md in octopress-3.0.10

@@ -255,10 +255,12 @@
 $ octopress deploy
 ```
 
 This reads a `_deploy.yml` configuration and deploys your site. Read below to learn how Octopress can generate a deployment configuration file for you.
 
+Note: The `_deploy.yml` is processed through ERB, which makes it easy to load configurations from environment variables.
+
 Deploy has a few commands you should know.
 
 | Commands                                   | Description                                                        |
 |:-------------------------------------------|:-------------------------------------------------------------------|
 | `octopress deploy`                         | Deploy your site (based on the `_deploy.yml` configuration)        |
@@ -356,9 +358,16 @@
 
 If you choose a bucket which doesn't yet exist, Octopress Deploy will offer to create it for you, and offer to configure it as a static website.
 
 If you configure Octopress to delete files, all files found in the `remote_path` on S3 bucket will be removed unless they match local site files.
 If `remote_path` is a subdirectory, only files in that subdirectory will be evaluated for deletion.
+
+You can also set up your configuration to read your AWS credentials from your environment variables using ERB like this:
+
+```
+access_key_id: <%= ENV['AWS_ACCESS_KEY'] %>
+secret_access_key: <%= ENV['AWS_SECRET_KEY'] %>
+```
 
 ##### S3 Headers
 
 You can create an array of header congifs to set expiration, content and cache settings for any paths matching the `filename`.